NCR 7458 - Manual (Page 57)

Chapter 3: Hardware Service 3-33
7. Unsnap the Lever on the CPU Socket and raise it to a vertical
position.
8. Carefully remove the CPU and place it in an anti-static packing.
18466a
9. Correctly position the new CPU over the CPU Socket and then
guide the pins gently into place. Once it is aligned in the socket,
push the CPU into the socket until it is fully seated.
18466
Pin #1
10. Lock the CPU in the socket by lowering the Lever and snapping it
into position.
11. Peel the thin plastic covering off the bottom of the new Heat Sink.